Brake-shoe



(No Model.)

G. J. SHIMBR.

BRAKE SHOE.

No. 272,911. Patented Feb.27,1883.

vUNITED STATES PATENT OEEICE.

GEORGE J. SHIMER, OF FREEMANSBURG, ASSIGNOR OF ONE-HALF TO SAMUEL J.SHIMER, OF MILTON, PENNSYLVANIA.

BRAKE-SHOE.

SPECIFICATION forming part of Letters Patent No. 272,911, dated February27, 1883.

Application filed November 22, 188:?. (No model.)

To all whom t't may concern Beitknown that I, GEORGE J. SHIMER, acitizen of the United States of America, residing at- Freemansburg, inthe county of Northampton and State of Pennsylvania, have inventedcertain new and useful Improvements in Brake- Shoes; and I do herebydeclare the following to be a full, clear, and exact description of theinvention, such as will enable others skilled in the art to which itappertains to make and use the same.

This invention, which relates to brake-shoes for railway-cars,street-cars, and the like, has for one of its objects to construct thebearingsurface of a brakeshoe of cast-iron and lead, or the equivalentof lead, to prevent cutting or granulatingof the cast-iron, as is thecase now with the common brake-shoe.

It seems to be afactthat the common brakeshoe, made of cast-iron, afterbeing in use for a short time, becomes granulated on the bearing-snrface on account ofthe frequent frictional contact with thewheel,whichcauses the brakeshoe to Wear away rapidly and injure thewheel.

My invention consists in a brake shoe or `block composed of cast-ironand lead filling,

or their equivalents, as an improved article of manufacture.

In the annexed drawings, Figure 1 shows in perspective one form of ahrakeshoe embodying my improvement. Fig. 2 is an end view, and Fig. 3 isa front view, of the same.

The brake shoe or block A shown in the accompanying drawings representsone of the many styles of brake shoes or blocks to which my improvementmay be applied. The bearing-surface of the brake-shoe is preferably madeat each end with a transverse groove or recess, I), of any desired shapeboth transversely and longitudinally, which grooves or recesses may bemade, at the time of casting the brake-shoe, by sand cores or othermeans; or these grooves or recesses may be formed after the cast-ironbrake-shoe is removed from the mold by suitable means. These grooves orrecesses are filled with lead or a soft alloy of lead, as designated byc, and should slightly project beyond the face, so as to come in contactwith the car-wheel before the body of 5c the shoe touches. This leadfilling may be either'cast or pressed into the grooves or recesses orperfor-ations' of the brake-shoe, so as to secure a firm connection, andthe lead lilling may be additionally secured to the shoe by means ofsmall rivets. The lead filling above and below, as shown, will, when thebrake-shoe is first applied to the car-wheel, give a good seat to theshoe. The object or oiiice of this lead filling or its equivalent in 6othe bearing-face ofthe brake shoe or block is to providea dry lubricant.The wearing away of the lead filling, and with the iron lwhen Hush, willglaze or slightly cover the face of the contact-wheel and shoe, whichcovering, acting in the nature ofadry1ubricant,willpre vent the cuttingor granulating of the castiron composing the body of the shoe, and atthe same time without injuring the tread of the wheel. This leadfilling, acting as a dry 7o lubricant, does not make the brake-shoe anythe less effective in operation, while it greatly lessens the wear onthe wheel and brake-shoe. The lead used can be of the cheapest kind ofhard lead, andaslight alloy of other nietals will not hurt the lead forthe use intended, so long as thepeculiar tough and soft properties ofthe metal are not destroyed; but pure lead is preferred; also, insteadof the transverse grooves or recesses to receive the lead 8ollling,perforations, or both perforations and grooves, may be made toreceive the lead lilling or its equivalent, and4 these distributed overthe bearing-surface.

What I claim as my invention, and desire to secure by Letters Patent is-As an improved article of manufacture, a brake shoe or block composed ofcast-iron and leadA filling, substantially as described.

In testimony whereoflaflix my signature in 9o presence of two witnesses.

GEORGE J. SHIMER.

Witnesses:

Fa.` M. RAUCH, MARY C. DANIEL.

